Grinder



' March 16 1926.

Filed March 24, 1923 12A z3@ ,Jff'l zz,

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March 16 192.6. 1,576,593

A. F. FROUSSARD GRINDER Filed March 24, 1925 2 Sheets-Sheet 2 NVENTOK @Way/Q A TORNEY Patented Mar. 16, 1926.

UNITED STATES PATENT OFFICE.

i ALBERT r. rnoUssAnD, or sfr. LOUIS, MISSOURI.

GRINDERL Application filed March 24, 1923. Serial No. 327,267.

To all whom t may concern.'

Be it known that I, ALBERT F. FRoUssARD, a citizen ofthe United States, residing at the city-'Of St. Louis, in the State of Missouri, have invented certain new and useful Improvements inGrinders, of which the 'following is a specification.

This invention relates to a device for nishing Or highly polishing the internal cylindrical surfaces of engine cylinders and :thelike after the same have-been bored, and has for one of its objects to provide a safety stopfor limiting the depth of travel of the hone in the cylinder and thereby prevent damage to the honer on account of its accidentally encountering obstructions beyond thev bore of the cylinder. l

v Another Object is to provide means for holding the blocks of abrasive material so that the same are readily removable for replacement, but are, also, retained in the honer when the same `is withdrawn from the cylinder.

A further yobject is. to provide eiicient means'for supplying the abrasive with lu y bricant.

Otherv Objects are to arrange for long springs, which are capable of vgreat variation inlength without taking on a permanent set and to provide a shield to protect the abrasive material Ifrom the cutting action Of the spring. l

In the accompanying drawings forming part of this specification, in which likeV numbers of reference denote like parts wherever they occur,

Figure 1 is an elevation of the complete honor; y

Figure 2 is a top view of the same;

Figure 3 is a transverse section taken On the line 3-3 of Figure 1;

Figure 4 is a bottom view; I

Fi ure 5 is an enlarged section taken on the line 5 5 of Figure 1;

Figure 6 is a perspective view of one of the blocks of abrasive material; and

Figure 7 is a perspective view Of the shield for protecting the abrasive blocks from the cutting action of the springs.

In the practice of my invention I provide a holder 1 having a cylindrical portion 2, plane sides 3, slots 4, and a hole 5 open at ends 6 and 7. End 6 is screw-threaded at 8 for the reception of a cap 9, having a socket 10 for the insertion of a wrench whenever necessary for the removal or replacement of said cap 9. The holder l is preferably of aluminum to secure lightness and consequently a minimum of vibration. i y,

A shank or spindle' 11 for drivingA the holder 1 is provided at one of its ends with a reduced portion 12 for connection to an electric drill socket, lengthening bar, or other suitable connection to a source of power. A transverse hole 13 through shank 11 registersv with alcorresponding hole in the k:drill socket-or otherl connection when thelend of said socket abuts against shoulder l 14 of shank 11. A pin passing through both holes secures shank 11 to said socket k.and causes both to rotate in unison. Shank 11 enlarges at 15 for nstiffness and enlarges further at 16 into flange 17 secured to end 7 of holder 1 by screws 18 passing through flange 17 and into tapped holes 19 in holderl.

Hole 5 when closed at bothvends 6 and 7 forms a pocket for the receptionof kero sene or other suitable lubricant, which is supplied thereto through threaded opening 20 inflange 17, which opening 20 is normally closed by screw 21. The lubricant is vexuded through openings 22 in holder 1 against the cylinder wall by the centrifugal force incident to the rotation of the holder 1. Tubes 23, preferably steel, extendthrough hole or pocket 5 and open at their opposite ends into their respective pair of diametrically opposed slots z4. The tubes 23 are secured to holder 1 by friction and by peening overtheir ends as indicated at 24. Y

Plates 25 are secured to the plane `sides 3 by screws 26 and are provided with bent ends 27 projecting slightly beyond and perpendicularly tol the sides of the slots 4.

Blocks 29of abrasive material fit in the slots 4 and have projections 30, which contact with the ends 27 of plates 25 and thereby limit the outward movement imparted to said blocks 29 by springs 31, interposed between each pair of diametrically opposed blocks 29 and'held in the tubes 23. The blocks 29 are protected from the cutting action of the springs 31 by shields 32 interposed between said springs 31 and blocks 29. The shields 32 are preferably formed of sheet metal and have perpendicular projections 33 formed by displacing some of the metal by means of vdies at 34. The blocks` 29 can be withdrawn from the holder 1 at the end 6. after cap 10 has been removed, but

the sh-ields 32 are retained in the slots 4 by the engagement of the projections 33 with the springs 23.

The depth of travel ofthe holder in the cylinder is limited by a safety stopping plate 35, adapted to engage the end of the cylinder and thereby prevent damage to the honer by running the same below the bottom ofthe cylinder. Plate 35 can be set on shank 1l to accommodate different lengths of cylinders by a setescre'w 36, which screws into hub 37, integral with plate 35. l

The slots* 4 arel provided with ends 38, which, in conjunction with flange' 39 of cap 9, prevent longitudinal movement of said blocks 29 in said slots 4.

Having thus described this invention, I

Ahereby reservethe benefit of all changes in form, arrangement, order, or use of parts, as it is evident that many minor changes may be made therein without departing from t'l'ie';V spirit of this-invention or the` scope of the following claims.

I claim:

1. In a grinder, a` spindle having an' integra-l flange formed at one end thereof, a hollow head having a series of longitudinally extending slots formed therein secured to said iiange kand extending axially outwardly therefrom, a cap removably secured tothe outer end of said head, said flange and cap adapting said head to carry lubricant, said-f hea-d having a pair of openings formed in the inner wall of each slot, said openings being adapted for receiving diametrically extending springs; an abrasive element positioned within each slot adapted to be forced outwardly therefrom by said springs, andmeans` for permitting lubricant to be discharged from said hollow head by Centrifugal force.

2. In a grinder, a spindle having an integral flange formed at one end thereof, a hollow member secured to said flange and eztending axially outwardly therefrom, a cap removably secured to the outer end of said hollow member, said flange and cap adapting said hollow member to carry lubricant, a plurality of tubes traversing the bore of Said hollow member, a spring within each tube, a plurality of abrasive elements carried by said hollow member and forced outwardly by said springs, means for limiting the outward movement of said abrasive elements, and means for preventing said springs fromdirectly engaging said element, said hollow member having a series of annularly arranged openings through which lubricant is' discharged by centrifugal force during operation ofsaid grinder.

3. In a grinder, a spindle, a hollow head adapted for carrying. lubricant securedl to said spindle, a plurality of tubes traversing the bore of said head, a spring within each tube, a plurality kof. abrasive elementsv car.- ried by said head and forced outwardly by said springs, means for limiting the outward movement of said abrasive elements, means for preventing said springs from directly en- ,cating with the hollow interior of the said body, blocks of abrasive material engaged 4in the said slots, a cap closing.` one end of they tubular body and having al flange projecting over the entraine-openings of the said slots to prevent withdrawal of the said blockstherefrom, a. flange closing the other end of the said tubular body and having a filling' opening thru which lubricant may be supplied to the hollow interior of the said body, and a driving spindle mounted on the said fiange.

In testimony whereof I hereunto aiiix my signature. Y.

ALBERT F. FROUSSARD. 

